Abstract
Experiments were carried out on the fluidity of silumin using a spiral type of metal mould to determine, (a) the effects of the pouring and mould temperatures, (b) the comparison with Al at a given temperature of pouring, (c) the effects of repeated melting, (d) the effects, of Fe and Zn, and (e) the effects of Mn, Cr and Cu on the fluidity of silumin containing more than 1.5% of Fe. The following results were obtained : (1) For a given temperature of pouring, the fluidity of silumin is much greater than that of pure silumin. (2) In proportion to the pouring and mould temperatures, the fluidity becomes greater and the effect of the pouring is 2.36 times greater than the mould temperature. (3) Repeated melting lowers the fluidity, especially at the 2nd to 3rd melting. (4) with increasing of Fe content in silumin, the fluidity becomes greater up to aboute 1% of Fe, above which lowers the fluidity. (5) Zn has effect on the fluidity of silumin up to about 3 to 4% of Zn, above which increases the fluidity. (6) The fluidity of silumin containing more than 1% of Fe is improved by the addition of certain amount of Mn. The most effective amount of Mn equals to about 70% of Fe content. Cr seems to have no effect on the fluidity of the silumin, while Cu improves the fluidity of the silumin a little up to about 2.5% and much more at above 5% Cu.
